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Engineering Materials
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Engineering Materials Practice Set-8

May 16, 2021

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Page 1 of 4

1. The crystal structure of brass is

F.C.C.

H.C.P.

Orthorhombic crystalline structure

B.C.C.

2. Compressive strength of grey cast iron in tonnes/cm is of the order of

35

57

710

1015

3. Perminvar alloy having constant permeability is an alloy of

Nickel, copper and iron

Iron, zinc and bismuth

Copper, nickel and antimony

Nickel, copper and zinc

4. The alloying element which reduces the formation of iron sulphide in steel is

Nickel

Chromium

Manganese

Vanadium

5. Which is false statement about tempering? Tempering is done to

Improve toughness

Release stresses

Improve ductility

Improve machinability

6. Bronze contains

70 - 75% copper and rest tin

85 - 92% copper and rest tin with little lead and nickel

90% copper and 10% tin

70% copper and 30% zinc

7. Sulphur in cast iron

Make the iron white and hard

Makes the iron soft and easily machinable

Aids fusibility and fluidity

Increases hardness and brittleness

8. Beryllium bronze has

(A) High yield point

(B) High fatigue limit

(D) None of these

(C) Both (A) and (B)

9. Chromium in steel

Improves cutting ability and reduces hardenability

Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

Gives ductility, toughness, tensile strength and anti-corrosion properties

Improves wear resistance, cutting ability and toughness

10. Cupola produces following material

Malleable iron

Wrought iron

Pig iron

Cast iron

Page 2 of 4

11. Melting point of iron is

1539°C

1489°C

1712°C

1601°C

12. Tungsten in high speed steel provides

Toughness

Hot hardness

Wear resistance

Sharp cutting edge

13. The hardness is the property of a material due to which it

Can cut another metal

Can be drawn into wires

Can be rolled or hammered into thin sheets

Breaks with little permanent distortion

14. Shock resisting steels should have

Low hardness

Toughness

Low wear resistance

Low tensile strength

15. Gun metal contains

90% copper and 10% tin

70 - 78% copper and rest tin

70% copper and 30% zinc

85 - 92% copper and rest tin with little lead and nickel

16. Nimonic contains __________ percentage of nickel as that of Inconel.

More

None of these

Same

Less

17. The alloy used for making electrical resistances and heating elements is

Elinvar

Invar

Magnin

Nichrome

18. Manganese in steel increases its

Ductility

Fluidity

Tensile strength

Hardness

19. Phosphor bronze contains

1% phosphorous

None of the above

2.5% phosphorous

0.5% of phosphorous

20. The machinability of steel is increased by

Sulphur, graphite and aluminium

Silicon and sulphur

Phosphorous, lead and sulphur

Phosphorous and aluminium

Page 3 of 4

21. Aluminium bronze contains aluminium and copper in the ratio of

40 : 60

10 : 90

60 : 40

50 : 50

22. Permalloy is a

Polymer

Kind of stainless steel

Nickel and iron alloy having high permeability

None ferrous alloy

23. Carbon in iron is an example of

Substitutional solution

Interstitial solid solution

All of the above

Intermetallic compounds

24. High carbon steel carries carbon percentage

0.6 to 0.8%

0.1 to 0.3%

0.3 to 0.6%

0.8 to 1.5%

25. Drop forging dies contain carbon of the order of

0.1 to 0.2%

0.25 to 0.5%

0.7 to 0.9%

0.6 to 0.7%

26. Preheating is essential in welding

All of the above

High speed steel

Cast iron

All nonferrous materials

27. Cold rolled steel sheets contain carbon of the following order

0.4%

0.2%

0.6%

0.1%

28. An example of amorphous material is

Zinc

Silver

Glass

Lead

29. Delta metal is an alloy of

Iron, lead and tin

Iron, nickel and copper

Iron, aluminium and magnesium

Copper, zinc and iron

30. Which of the following is the binding material in cemented carbides?

Nickel

Vanadium

Iron

Cobalt

Page 4 of 4

31. Which of the following is used for bearing liner?

Bronze

Babbitt metal

Bell metal

Gun metal

32. Corrosion resistance of steel is increased by adding

Nickel and molybdenum

Chromium and nickel

Aluminium and zinc

Tungsten and sulphur

33. Steel made from phosphate iron is

Ductile

Tough

Brittle

Hard

34. The presence of sulphur in pig iron makes

It hard

It brittle

The casting unsound

It easily machinable

35. Free cutting steels

Are used where ease in machining is the criterion

Contain carbon in free form

Require least cutting force

Do not exist

36. The hardness of steel increases if it contains

Martensite

Pearlite

Cementite

Austenite

37. Hardness of upper bainite (acicular structure) is about

RC 80

RC 57

RC 65

RC 48

38. Connecting rod is usually made of

High carbon steel

Low carbon steel

Aluminium

Medium carbon steel

39. Argentite is the principal ore or raw material for

Zinc

Silver

Tin

Aluminium

40. Weld decay is the phenomenon found with

Mild steel

Cast iron

Nonferrous materials

Stainless steel

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A Demrot is the founder of VideRime Online Learning, a leading engineering website. He did his BE Civil and M.Tech Structure from RGPV University, Bhopal and has been working as an Assistant Professor in a reputed college.

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